Use different installation userdirs for each installation with the help of "--userdir <somedir>" command-line switch, e.g.netbeans-6.0-windows.exe --userdir "%USERPROFILE%/.nbi" (that is the default)netbeans-6.0-windows.exe --userdir "%USERPROFILE%/.nbi2"netbeans-6.0-windows.exe --userdir "%USERPROFILE%/.nbi3"Futher uninstallation is possible in that case - user should just run appropriate uninstaller or entry in Add/Remove Programs dialog (on windows)